Grocer's son developed first shopping center in Cedar Rapids, Iowa 1954 with his 2 brothers. Took General Management public in 1970; real estate investment trust liquidated 15 years later for 100% profit. Relocated to Chicago after brother Martin died 1995, renamed company General Growth Properties. Remains chairman; son, John, took reins 1999. Today nation's second-largest REIT owns 200 million square feet across more than 200 malls and planned communities in 44 states. Company recently gave health insurance, higher wages to shopping center janitors.